Copyright © Tony Burfield Dec 2004.
Adapted from a forthcoming article for Aromatherapy Times
The media has had a field day just lately, seeing toxic dangers everywhere
arising from nasty chemicals in our immediate environment, and blaming them for
the hitherto unexplained rise in allergies - as manifested by symptoms of eczema
and asthma. To be fair, there is certainly a cause for concern in this area: for
example, Melke (2003), referring to Bristol University’s Children of the
Nineties study, reveals that nearly one in three children has suffered eczema by
the age of three-and-a-half, which is triple the rate in the 1970’s. Part of
this media attention is generated by the EU Chemicals Policy, which aims to
evaluate all substances which impinge on the environment, and has highlighted
chemicals used variously in the home, garden and working spaces. Against this
background, the wariness of the Alternative Health Movement towards synthetic
chemicals is already legendary, having been previously commented on by Vickers
(1995), who contrasts the positive concepts of natural, organic, spiritual,
healthy & holistic against those of the synthetic, chemical, unhealthy and
mechanistic. Certainly, levels of undesirable chemicals such as those used as
flame retardants (like polybrominated diphenyl ethers), insecticides, carpet
& upholstery matrix materials, plasticisers (such as alkyl phthalates) etc.
are now commonly found in Western homes and in our workplaces, and their
long-term persistence in human bodies is cause for enough for health concern.
Fragrances – the new bête noir of environmental
The finger of suspicion is also pointing at fragrance volatiles - one is
tempted to say, raising it to a level of near-paranoia. Pat Thomas (2004) in a
recent article in the normally sensible periodical The Ecologist,
suggests that there is no difference between conventional perfumes and
pollution, saying “fragrance chemicals… include … many other known toxins
capable of causing cancer, birth defects, central nervous system disorders and
allergic & asthmatic reactions”. It is surprising therefore that those of
us who have been employed in perfume factories breathing in these allegedly
noxious ingredients at high odour concentrations for much of our working lives,
seem to have enjoyed such rude health over the years! Moving swiftly on, Thomas
goes on to list “forty-one known (fragrance chemical) ingredients” found in
the perfume Eternity Eau de Parfum (Calvin Klein). Thomas suggests that some of
these “known” ingredients reproduced below may have dangerous properties,
although no actual concentrations of components allegedly contained in the
perfume are given. Once the curious non-systematic chemical names in the text
are translated, you may recognise one of these “dangerous” ingredients
as vanillin, which you might find lurking as a flavouring in the
exceedingly toxic local national dish “Crème Anglaise” (or custard as it is
Benzyl acetate –
said to be irritant and also said to be linked to pancreatic cancer.
benzyl alcohol) – said to be irritant, CNS disruptor & carcinogen.
phenylethyl alcohol) – said to be a CNS disruptor, carcinogen, affects bone
– hormone disruptor, irritant, carcinogen.
Eugenol – said
to be an irritant, a cause of contact dermatitis, pesticide & insecticide
– said to be highly irritating to mucous membranes and a CNS disruptor.
(aka vanillin) – irritant to mouth throat eyes etc…kidney damage, CNS
Of course in the real world, toxic effects of chemicals are directly related
to the dose, and splashing 0.03 ml of alcoholic perfume containing minor
concentrations of these components behind the ears is unlikely to promote the
effects listed above, even in a small minority of extremely susceptible
individuals. Further, many of these components identified are identical to those
components naturally occurring in the scents emitted from flowers, meadows &
pine forests, or are responsible for the odour & taste of spices and natural
flavourings etc. – so what are we to do? Mow down all the flowers and trees,
since they give off these dangerous volatiles?
Odours from Living flowers and trees
Here are a few examples of the same “toxic” chemical odours listed above
in the Calvin Klein perfume, as are given out naturally by living flowers:
Benzyl acetate –
in jasmin, narcissus & hyacinth headspace odours and in gardenia oil, ylang
ylang oil & cananga oils.
Benzyl alcohol –
headspace odour of picked jasmine flowers, narcissus, lily of the valley,
hyacinth, honeysuckle, water-lily & meadowsweet.
alcohol – headspace of rose varieties including the yellow tea rose,
broom, phlox, & daphne.
– found in the scent glands of the musk rat! Other w-macrocyclic
lactones are found in forest floor litter and the sun-struck resin of Pinus
pinaster (Kaiser 1997).
Eugenol – in the
headspace of hyacinth flowers & carnation flowers; and in the oils of clove,
cinnamon leaf, pimenta berry, W.I. bay oil, & basil oil CT linalol.
– in headspace odour of flowers of white freesia, polyanthus, lotus, and in
the headspace odour of pine oils & resins.
– in vanilla beans, peru balsam, & benzoin resinoid.
reality we are continually exposed to emissions of natural materials - for
example – as the volatiles from flowers and from leaves. Schenk (1979) has
estimated that 438 million tons of monoterpenes evaporate into the air
continually from biological material sources – and we are probably the better
for it, in terms of the pleasure it gives us!
A Miscellany of Topics regarding Flavourings, Cosmetics,Volatiles and
Attention is also given by the press to synthetic chemicals consumed as
flavourings. Corkwise, which we are told is a company of analytical chemists in
Surrey, have been finding (added?) pyrazines in South African & New Zealand
wines, and theorising over their significance. The same article quoting the
above findings (Lawrence 2004) reveals that Michael Fridjhon, a wine critic, has
indicated elsewhere in print, that ranges of fake flavourings are used to give
characteristic notes to retailed wine, such as blackcurrant flavouring added to
Cabernet Sauvignon. Strange that we don’t seem to worry overmuch about any
health effects of these unnatural additions to “real” wine. More scary
still, (Ravilous 2004) has also run stories on findings of a material in mains
water supplies called ptaquiloside, which results from bracken poisoning the
water all over the world. Ptaquiloside is capable of causing cancer epidemics.
Meanwhile this year also Poppham (2004) reports on the carcinogen methyl eugenol
in Ligurian basil leaves used to prepare Italian pesto, the levels of which were
alleged to be 600 times over the accepted safety limit (quoting Prof. Francesco
Sala of the Umberto Veronese Foundation). Unquantifiable concerns facing
aromatherapists regarding methyl eugenol exposure from essential oils used in
massage have been discussed recently by the author (Burfield 2004).
A further article alleging health concerns from fragrances was presented by
Hilpern (2004), this time in a pull-out supplement of The Independent
newspaper, and covered similar ground. A quote from Lindsay McManus of Allergy
UK is included, who informed us that ‘second
hand scent is more serious than second-hand smoke’. Hilpern
points out that Halifax, Nova Scotia discourages the wearing of fragrance in
public places, and Santa Cruz, California bans the wearing of fragrance at
public meetings – perhaps this restriction will spread? The well-known
anti-fragrance campaigner Betty Bridges is also quoted in the article,
suggesting that people ask for products which don’t contain fragrances [Betty
Bridges had previously published a highly referenced article on health and
environmental concerns from fragrances (Bridges 2002) which concluded that there
needs to be a system where adverse effects of fragrance chemicals are recorded
and evaluated. Bridges also mentions aromachology in the scope of her article].
Cameron (2004) also reports on negative health effects from cosmetics,
stating “without exception, modern perfumes are manufactured entirely from
petrochemicals”. It is not disclosed however if the author drives a car –
petrol production inherently is connected with by-products which need outlets
– and fragrance chemicals – many/most of which have undergone rigorous
testing procedures - are a socially beneficial outlet for these co-produced
materials. Further, lets not forget that if we are looking for bogeymen, the
combustion engine has a lot to answer for - particulates & emissions
themselves are responsible for high levels of respiratory and other diseases.
Cameron quotes the Journal of American Toxicology (no further
reference details) on fragrance chemicals penetrating the skin advising: “some
(fragrance chemicals) have been shown to cause discolouration of internal
organs, others are toxic to the liver & kidneys. Some accumulate in fatty
tissue and are passed on in breast milk”….
Whilst I pass on the prospect of bleached kidneys, I’d like to remind
readers that the Research Institute for Fragrance Materials is an independent
international organisation (established in 1973) which actively investigates the
safety of fragrance materials. It has indeed found that one or two fragrance
materials such as acetyl ethyl tetramethyl tetralin and musk ambrette are
neurotoxic, and the International Fragrance Research Organisation (IFRA) has
recommended that these substances be prohibited from use in perfumery under
self-regulation. This doesn’t mean that you won’t still find musk ambrette
as an ingredient of joss sticks brought back from your holiday to India – but
it means that you can check on the full list of IFRA prohibited and restricted
materials in perfumes which can be freely viewed at http://www.ifraorg.org/GuideLines.asp.
This illustrates the responsible attitude that the fragrance industry takes
towards safety, and you, gentle reader, as a member of the public, can ask your
supplier of fragranced product whether the fragrance in question is IFRA
compliant – although adherence to IFRA regulations is just one of the
regulatory safety hoops a marketed perfume will proably need to jump through. It
is true that we are learning more about toxicology all the time – after all,
less than 100 years ago we used to put copper sulphate in canned peas to make
them appear green! Now we can add some safe ghastly green dyestuff instead!
Volatile Organic Carbons.
Hilpern and (separately) Hawkes (2004) covering the same theme on toxic
domestic chemicals, refer to a well publicised study, by Alex Farrow et al.
(2003) and since as it has attracted so much media attention, we will consider
this article in more detail. Farrow looks at the catch-all category of volatile
organic carbons (VOC’s), and is concerned with the health of mothers and
infants in relation to total exposure to VOC’s (TVOC’s) from household
products. To carry this out a large number of medical histories were followed
over twelve months, and TVOC’s were determined in 170 home environments of
Avon, with the help of the Avon Longitudinal Study of Partents & Children
Study Team. It becomes clear fairly early on that the term VOC’s in Farrow’s
study refers to propellants in aerosols and solvents in airfreshners, such as
toluene, m-xylene, which were assessed by Tenax tubes placed in the subjects
living rooms and bedrooms. No distinction is made between solvents and fragrance
ingredients, so the class of compounds responsible for the observed symptoms is
Farrow et al. found that higher airfreshner & aerosol use
increased the TVOC concentration, and that infant diarrhoea and earache were
significantly associated with airfreshner use; diarrhoea & vomiting were
significantly associated with aerosol use. Headache in mothers at 8 months or
more past birth was significantly associated with the use of airfreshners &
aerosols; maternal depression was significantly associated with the use of
The findings of this relatively small-scale study are quite thought
provoking, and appropriate explanations are even more so! Little hard data on
VOC’s really exists in the literature. Some papers are reviewed by Farrow et
al. on chlorinated solvents and oto-toxicity (oto- meaning ear), and on
urinary tract disorders from solvents in mature females seemingly associated
with impaired immune system responses. Farrow himself has previously looked at
the relationship between nitrogen dioxide levels as an indoor pollutant, and
infant gut well-being. It is also intriguing to remember recent findings that
babies born by Caesarean section suffer more from infant diarrhoea1
and other conditions that those born normally (perhaps because of the beneficial
effects of micro-flora gained via passage down the birth canal) – making it
more difficult to establish a base-line for “normal” health. It is also
permissible to think about chicken and egg situations – do mothers use more
airfreshners & aerosols when diarrhoea and sickness visit the family
members, or say, when they are depressed (i.e. the connection is non-causative)?
Most of all the connection between sickness and VOC’s as fragrance - which can
include essential oils and absolutes, just as much as fragrance chemicals – is
not firmly made here.
A culture of fear (of terrorism) is currently being used both sides of the
pond for political ends, but the axis of evil doesn’t necessarily extend to
the collection of fragranced cosmetics on your bedroom dresser. Certainly many
bad things are currently being laid at the door of household and home-care
products, cosmetics and fragrances, including allegations of many minor
illnesses and allergies. Phobias about synthetic fragrances are being pandered
to by the media, who are obligingly providing plenty of scary, and often
inaccurate, material. It isn’t a great step to include the volatiles from
essential oils and flowers as unwanted VOC’s, which can invade the personal
space of these sensitive chemophobic individuals, and which may provoke illness
& distress, either real or imaginary….
My take on this is that VOC’s cannot be lumped together as a group as
Farrow et al. has done, and proclaimed harmful per se. It is far more
likely that specific toxic components (chlorinated solvents, aromatics like
benzene) are the causative agents, and that fragrance components are being
tarred with the same brush. In the case of fragrance phobia, the power of
auto-suggestion is such, that a negative image of synthetics to some suggestible
individuals people may “bring on” imagined symptoms.
As regards any inferences for aromatherapists from these reports, we can be
assured that the safety of essential oils is a relatively well-studied subject.
Whilst toxicological inhalation data on individual essential oils is admittedly
sparse, topics like skin sensitivity and reproductive toxicity have been the
subject of many studies, many of which are on-going. Further we have a fragrance
industry which has been producing essential oils and absolutes for more than 140
years, and as mentioned previously, whose workers haven’t experienced serious
occupational health problems like those found in mining, cotton and asbestos
industries, in spite of the high levels of exposure to fragrance volatiles. The
problem then is often more that those concerned with safety legislation matters
in the EU, or at National Government level are not well versed in finding
reference information – and so we get strange decisions like the suspension of
the free use of citronella oil in retailed insect repellents in Canada on the
basis of lack of toxicological data (!) The problem is arguably not one of lack
of appropriate information, but leading the horse to the right trough!
1Thanks to Martin Watt for recently reminding me of this. A
reference is “Caesarean section babies may have more allergies and
diarrhoea”, reported at http://www.medicalnewstoday.com/medicalnews.php?newsid=15292
Bridges, Betty (2002) “Fragrance: emerging
health and environmental concerns” Flavour & Fragrance Journal 17,
Burfield, Tony (2004):
Cameron N. (2004)
“Toxic Toiletries” Kindred Spirit Issue 71 (2004).
Farrow A. et al.
of Mothers and Infants Related to Total Volatile
Compounds in Household Products” Archives
of Environmental Health,
Vol. 58, No.10,
Hawkes Nigel (2004) “Danger Alert over air
freshners” The Times Oct 19th 2004 p11.
Hilpern K. (2004) “Trouble in the air” The
Independent Review Tues 9th Nov 2004 p8-9.
Kaiser R. (1997) “Environmental Scents at the
Ligurian Coast” Perfumer & Flavourist 22 (2) Mar/April 1997
Lawrence, F. (2004) “Blanc check for wine
purity” The Guardian Saturday Jan 24th 2004 p7.
Melke, James (2003) “Child Eczema ‘has tripled
since 1970’s’ ” The Guardian Tues Dec 23, 2003 p 5.
Ravilious, Kate (2004) “The fatal fern” The
Guardian Review “Life” Section 9th Sept. 2004 p9.
G.O. (1979) Perf Kosm 60,
Thomas, P. (2004) “Behind the Label: perfume” The Ecologist 34(9)
Nov 2004 p30-31.
Thomas, P. (2004) “Behind the Label: perfume” The Ecologist 34(9)
Nov 2004 p30-31.
Vickers A. (1995) Massage & Aromatherapy Stanley Thornes (Publishers) Ltd.
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